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    Bison were killed for their meat, their fur provided warm clothing during cold winters. A. since B. while C. when D. as 【查看更多】

     

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    More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.

    A．to have fallen

    B．having fallen

    C．to fall

    D．falling

     

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    Bison were killed for their meat, _______ their fur provided warm clothing during cold winters.

    A. when　　　　 B. while　　   C. as　　　　  D. though

     

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    More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.

    A．to have fallenB．having fallen
    C．to fallD．falling

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    More bison were killed．The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.

         A．to have fallen     B．having fallen      

           C．to fall                D．falling

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    Bison were killed for their meat, _______ their fur provided warm clothing during cold winters.

    A. when　　　　 B. while　　   C. as　　　　  D. though

     

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